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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2976f9f68bbd2c5b9145fd008b8a4deb502ced3114d907f96d852ac24b6bf6e' 
  AND token = 'xl0TMShMOpLlSFCAHhWXDYm+hH/i1FlMLs07fH+YCQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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