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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8b7702960c491ad0c76983e732a8a8c2b7c6d386d7cb8cc519fc187269fe19' 
  AND token = 'vcfUCsQU1H9oWl9ux6JlGeqUYl2ld2NsR/1qi27gAF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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