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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3b1fa28b3302783202c5ea4c586abb69249bcd01b05bd933cd1580880b44d7' 
  AND token = 'n8m9GH1AMz0ZmuFWDqceH6pBqB/yeVkgXGfZpdrED+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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