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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15748fa4d6d9ca90f112d30f3c8aafc07769b7dedf21188bcd3d228c8e77d02' 
  AND token = 'ko+tcfQiEghRCekIUvHYM3flkRiR2Od4qJRsmKgX9dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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