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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0822e6719cd2d3bf0ae6472d9bb453742fb349f7861f9e4b985111bbd0e5be5d' 
  AND token = 'fTV6HdTC5V5116b4mRl19+eV+LR4yU5HTV2yBH04X2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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