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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2dda4ef26607cc8e870d612d4e17276b0916cc6e3d5460efbcbe129b8ab87b' 
  AND token = '3CrSQtk9He5oe1JSmdOvT8f5p7v+BP0Faa6pIiJDwnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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