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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6c2ef2b643dd7807a056dafc1f3bece0ef876413fe1b6e25fe7cda88a0d9e5' 
  AND token = 'Dr4z23vSDRA1Tvu88AGyi5g99qvF6k8gBp6t8CuNJQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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