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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9723dd7b3d972a74f2a963223e336974778c7dd46a52b0cbf41910f2aeda7045' 
  AND token = '+b1NuaSFomGc9/KpIStF+3BLj4g/VBRbbVjvfg4mh04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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