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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e03dd019ff89a459d52d12840719e55384246322b907cb602d6c4925eacbb04' 
  AND token = 'l+Ce52sFPhWTQy/SvreCAhA+UtD2iR2iSyO4NTRKNEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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