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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0e547c86d11514820440f6ad87ce94d63c01f5ea4da7376f6a6b23de693763' 
  AND token = 'kYsUjjWgBHsYQUz6w0CYxWf4fSZjixqWYblq26Q/Ja4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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