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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd975d51cda862732c3bc81d80c05e9190ed13dddfbe3b6acb2626d2c2a88211a' 
  AND token = 'EGP0BMj59ZOBt9FfPCVqRUQSJYIxx2pEFleovC7Nj9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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