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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71840656b77deefb7dcace3ba13cbccec8bde5255ec6a64c6cf62e8f320d5e87' 
  AND token = 'IGSR6w138T3+KYnVG/OZwULdVuxE0MBvciDyF2Y6q40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}