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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03a4772f478fb74c9ba2fa7bd3001d6b288885b194b1073183fc275ddb83d01' 
  AND token = 'nZ5kQHcKepQJYUxJxQJgAxJIh8ajhAsXDx/4s7nK5Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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