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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '453ad49416815368f301386bba327d681efec8eecaa9fc701e4595a68af3a878' 
  AND token = 'DySpcqaF9ibuPhQThlb2gh9WyiOv1yA3MAZ4k9tM/No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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