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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8792d8f1e1e096d3e17941fc0fc2308d775b5575faad2cc63b9f1fc573652ce' 
  AND token = '54vci1VGGdT5oT7GR5aYoPGHq1roeCosBLIs/7eFXO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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