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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a56aef2b8c20b39fd984c3d5073580c450362d32048936ebcf9bc75e165183' 
  AND token = 'gsVHg3sidsCaxLiVYkDm8xUvAq5tJ19gscKwgnG8w6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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