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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cdfa32ab48cc071da8ccb79d3a459ce265a6cb5e488b9d3fe0b609858c6ad6a' 
  AND token = 'cYF68uyd1fnQr3RUmgW5pbm1ILJE00XIHxIOLerMeUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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