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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e3340fe11a7f292133fb622d3a49f986b66b7a9c6d72046e57b41c12a94473' 
  AND token = 'O/uh6n+lsuPlP87amlm2OUH7SIOfkyZn/vaQPfm6cnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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