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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89dee19634821e632870e75992fbe7b43e0e99621b62e979d4e22a2d16db9b69' 
  AND token = 'c1m+cNVfX60T5x4F9Qp4IhFM2rvjAin9sWON4UpSYIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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