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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b04660150b0b142400baba8a808044699f50791f6dab086067fba13095475e9' 
  AND token = 'QNpcxEgzU0RWD4yPLTqQfeM7rnMGik+k7RcrZePbXwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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