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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e1e51107825704c6894f0990d2e11f708d03380060c73504786bef20de1724' 
  AND token = 'sU8i3DFah4RQICYFYh+rBIpvIWIBNw2Zc8UXs5697Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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