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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95d2975439b35c6c92f50cd3cf74b91f302c8d6b0ee54d4d8c66bfc78536bfc' 
  AND token = '3Qt9f/qKFZnoR5DwQurom14QF3X20W3nQup+KCiAOGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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