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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9082ee093b4e0be274a16a2df52f8320d834b01b8c23c9673f75ba0e4996763f' 
  AND token = '+ocYIAoVEIhSCkBl59I5/vALaDd9fqrlsdU4bBhemYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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