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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11fb36b985045ee72cf3797fca0a93c43a910d892aa53a1fd55e6e74fd6f4cd5' 
  AND token = 'XbMWxTmBJfKSvUauEnC4rbRxw8tQ1OFasL+FeESsySg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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