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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3247e19d4066a6f2d759b1f36fa8d2007e4b88fb25fccac8e841dd9ee45bf23a' 
  AND token = 'l1A39BlFV5/T3AGRTUDZKYIostNXK1eN6QSusLUchfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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