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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07c6b3ded6f3cb0eec4d908700858b41d7a8728d4caa3b503b2904d63680c0b' 
  AND token = 'nUpAbbTp9UHBM6X8W0uF1Lay65aJ3TkebUc74ginu04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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