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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259fa9f0841d20811306f29757adb2292436d4c41a5eeafeb540c60d0c17665c' 
  AND token = '/UjmS0fRtuRwhWFOvqF01WIJ5s317zFJazu67NR3aAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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