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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc89d7b0bd5cea5a0876e7e8e4ceeffb375b417afa2d67d6bc0cf5c98f780a13' 
  AND token = 'JlNpbhVShPCduso1PzHoB7C0tsA9a7NnQxNgvtng2Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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