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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409a14f155917e97eeba74a1353a12de2369751962b87cd9ca0e72870e4f8490' 
  AND token = '6hog22kQeVHmuowlEjujj1WA5M8KSTWR71xKmYbngu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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