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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8379ace669d89585fdcee1d04ce6993e82ebaf7566f51c881fb4b7538605b2d8' 
  AND token = 'y767UWLs5iA1aIBZqWPp4tqAwn0V6B2Ox3XyWVja4sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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