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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38012093b99c34ad1ce6fb1f0b3df5544362089ee460f378b0c6df06a3bdaf36' 
  AND token = 'X0RVqIPBBHwOZGMf/QUsNWTTlSIidZQjbvqDxGuaQiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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