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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917e89372c4a0bfe1748e41afe925407bd597ee9c4dc070c80173df794ff49f5' 
  AND token = 'b8q8EHGbXsDqs9rdGPG0GD92yBTlFahnnarzDhgS0pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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