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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639016b83357317974fb9630550b5f447225232c20e77db0000ada203ffdf8a1' 
  AND token = 'bQtxMAb1Ut7zPKDC0xw4T4FRsXyQ9ERJ3/5yNZDpdDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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