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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e36e3917d76ea4141df2e4ac7fa7a0e86b6417c7fc558befbe102c39b25c141' 
  AND token = 'LNfHF2BkSHYj5qQuRyBM7z4h4tO5TKucUAEH1tkgukY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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