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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85bed688795d63abdb0b1924e5fabbb2a3a1c422176f354cded435296a879a8' 
  AND token = 'gErQ2n7QZ68YN1PaxA+Q1elDlTEa0i7/dTxht9b2YyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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