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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46352aeb97695fad442c56a8b9a39ffe0f6610b590ec6e8067f820effcf0d228' 
  AND token = 'XVKdgw9es6uMI0sjahuRyaE9A0dHlhs8xnV/QHSWtsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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