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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '046b1a1d02208d04e7afb392b06d41f32e440a6dc081f936d8a15fa509ab1bbc' 
  AND token = 'dHWIoZ72xnUBkO+1urM6MjoLggWn1xiuuzc8i6s5AQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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