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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d0b1d88c014cb63a86608e08e4a1f49ef99ecafc7e7c591acb20386a7cb7891' 
  AND token = 'alj/+D5PCuwP63slfLOuFFqaIhZeYxWQ5j2bXFYYmtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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