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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cacc5932491bc8de8a77d51ef7f2721d8c8a3e4c8b6db678932d14f3588ba5d' 
  AND token = 'Ic9ntccT1RgtEf0/iv8yC9Mmx7S17Unc3oFR0xoadg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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