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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d70cfa61599a6cac454e660ad2cebdf7baf4d57dad0dc90f1e62e798dc15f5' 
  AND token = '8v9x5cJ3ia+fJ5fUlhfng8Fq44OskVyH/DhArJMKZHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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