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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '075098a4778f3882b442320713f06dfa80628c070c0e3dc6424f70bb226b7255' 
  AND token = '5P23Ov7nj5u5g2H+I3gjBITif0CWNOlgk8lO3JgIaZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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