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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a440219316f442b427d628042ab82430e1e8d25483b92cd7e58384561fd12e57' 
  AND token = 'Agyvx9TeaOQTl8Q45e0qFXI9Ncgjps1ZRd2SsvDmA6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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