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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de17b9144f140d6391197ab5f20b779d1796e48023306f521d39ae5042510092' 
  AND token = 'iyPwh8sM0MvimqdmdqRIY0LAof+HHjSrpaBCrvmb9XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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