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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4651a29b20d574df186d5a788689e0062a07add8e13b4ed52b4c771b4ffe19' 
  AND token = 'u5Ld1n8l/7Ktbd9D/3OwIFFtKAj+IDf92GIsu3nNbug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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