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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce770150a416a7ebd40bfed0458788075c0f5ee9cb250b6d575c9803e4fd4ea7' 
  AND token = 'qcaISj21zzEd44Vm7ZrH4inUxRk76kSSwnpvpMGXxeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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