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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c539cbd69f319e9e839be5d269a85c416d4580716a73d9727faaeca7d85ad82' 
  AND token = 'QPDSHoGUbIEinvxoiY2TAZlgtXexwp9PjVBNueljkI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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