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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cbb83a54455f177174c6aa9652ef85b2033bf7127c9712be33c5e92520afffb' 
  AND token = 'h03xvYot28iR4cl1N2dLVADWs9+2tZHIVcZlHIHdkus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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