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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee01aef9c91409b36894af471990d4c4816c85d36d4a206c112c58df90aa518f' 
  AND token = 'glS19F/AK+SBpLj5AO5NyNhP5fv3d/mGgmdqPTZmPm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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