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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65801b45041e307d26b846e42195493032058b32cf235a53af29d64236831b62' 
  AND token = 'LsoHC6Z5a9t80dvP4bJf2wQOIUbFPwVITue02awKwfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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