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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd0a380e388deb6dacf322eefb1add72c1ce04bb97268c9336bdd4c669ed874' 
  AND token = '4ifZ97c3Lp+hBFouPOiogIwAWAquiNExZ7UzjGc+h8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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