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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d19753dcbe66dde3b2aa0190022cf2a1e4c0dad4caad9f4187c6682393b22e3' 
  AND token = 'M4EqLNzFKInX2D9GBFlzRaoR9LUsTSBlkXS45VRJ67k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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