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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f634d0b8b4919af5ed2086fe2c486ff3fe1493c1da213acc4224c2889d9480e3' 
  AND token = 'CXdV1F7L2qHd3UcwOK0xxwRH84eYuiao8JZoTfgCTLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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