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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b686960192c1af21c9451b253e599684ccee48cc2b8e704b1468b0bba1b3a4a0' 
  AND token = 'ZmHmS9clkeFctyZsHRYiD7JPCwseI1bicXwm2ArkyBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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