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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ba70775d818a356cdc612e21b345e27a07b093df24c38f3b883880d43c3d90' 
  AND token = 'uahcyVAOjOQe4/QFbH+UQuFC0I2dlNELtPpYbkx35oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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