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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26341c2a77cb528e6efb7e57bc3b05d9acbd71a9d135bcb8e3bf9345c434463' 
  AND token = 'EqvnnjxjZKYb1D78/tMNI2gAHNIwittOAmf3a9yshao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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