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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bede4b4b141bb5467756f1a5723b7a1e434da8f2e8fc50f64058d2945d3942c2' 
  AND token = 'szUzLdboT061J7IpUDJPbFtKJ/EWkEJADE30tQLMJbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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