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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5574928cb0e625ee55267b7a62573883b02147281d6e7c7a1da86b1103e0a6c' 
  AND token = '+fGYUM2ygwzRdW8wewIrqf/ds08NWMNTAb5UPyDhRvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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