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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '374f7f7b81b42011bdb75535b60bb91a61d5391effa07b404652ca9b221b5ea1' 
  AND token = '5BaS6iXKseGJKcqeKH5kavwSd40Y33WmvBGPow7OJ6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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