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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f7509ca5f1333969e7e1a3c4ef2cd1a498469fc707e5758401755b0953b8f93' 
  AND token = 'F4cD77+ndi+E6BFYkDAdfPBk05ooZIal2Tbs1/If314=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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