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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18423a84e2f515c94b57c0b7e59c41903cf15aed55bd8adae79d9ae406963fe5' 
  AND token = 'JStlFnEu+PYrgFE85nzif/sIHoWRsxJDcEpk/IFFZus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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