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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c838d9d3b075f3965f9ec7be534608eff66cb2edb8a105b23d1dccead5de36eb' 
  AND token = '1iYTqIWniDc+v2tykFZMzTL1NkgUJrWYJzAvbKUrVXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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