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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c06969e2dee6143d69077e42724b9689edced4c1be3f355838d040dd7e4a95' 
  AND token = '7uV47tn9Z1jXNaGUSySg5wwkAWlJ9StdrTXO4YhnAwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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